Lee Joon-gi, 'Knowing Brother', appeared at the request of IU.
In JTBC's Knowing Brother, which aired on the afternoon of the 20th, IU and Lee Joon-gi appeared as guests.
“I wanted to do the show because it was my 10th anniversary this time, but I didn’t want to do it, and I’m going to have to prepare for the concert.
“But when I went out alone, it was not funny, so I looked for a friend of the Super fun around me and it was Lee Joon-gi, so I asked him to call me directly.”
Lee Joon-gi said, “Actually, entertainment was a burden. I was asked by the IU, but if you give me a late answer, will not it hurt the IU and the production team of the Knowing Brother? "
About IU
Lee Ji-eun, also known by her stage name IU, is a South Korean singer-songwriter, record producer and actress. She signed with LOEN Entertainment in 2007 as a trainee and debuted as a singer at the age of fifteen with her first mini album Lost and Found.
 Wikipedia